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RE: How do you tune and then use..........
 

That may have been true with older heads...mostly solid re-shapenable heads.
Todays heads (Including Muzzy) are held to a tighter tolerance than you can shoot. Changing blades should NOT effect your flight, and in my experiance, the Muzzy practice blades work VERY well.
I NEVER resharpen replaceable blades...doesn' t mean you CAN' T, just that I don' t (I WILL touch them up SLIGHTLY though when new) Thin blades get nicks in them, and you end up taking (IMHO) too much matterial off when re-sharpening them...NOW you lost your tight tolerance.
Simply put, tune your heads with the practice blades...or, if you must, use hunting blades to tune your arrows/bow. Then just put in some fresh blades for hunting.

RE: How do you tune and then use..........
 

Red:

I have a set of broadheads that I use just for practice. I spin and shoot my hunting heads once (with practice blades) to make sure they are in OK. I then attach new blades, spin em once more for good measure and if they pass they go in the quiver.

I agree with Mahly, no need to sharpen replaceable blades.

Dan